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Tensioning device for extending a threaded bolt

a technology of extending device and threaded bolt, which is applied in the direction of threaded fasteners, load-modified fasteners, screws, etc., can solve the problem of only being able to set into operation

Inactive Publication Date: 2014-01-23
HOHMANN JORG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a tensioning device that includes a wireless signal path to evaluate and control the tensioning process. The device has a transmitting module and a receiving module to connect the tensioning cylinder and hydraulic supply. This eliminates the need for additional lines and makes the device more compact. The pin is designed with a longitudinal guide in the exchange socket and can be easily replaced when the socket is replaced. The bottom of the pin is widened to ensure constant contact with the bolt, even if the bolt has a depressed thread. This enables accurate assessment of the bolt length even when there is imprecise evaluation results.

Problems solved by technology

Rather, setting into operation is only possible after the evaluation and control unit has in principle enabled the hydraulic supply.

Method used

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  • Tensioning device for extending a threaded bolt
  • Tensioning device for extending a threaded bolt
  • Tensioning device for extending a threaded bolt

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Embodiment Construction

[0022]The hydraulically operated tensioning device serves to tighten and optionally also to release highly stressed screw connections. The tensioning device has the task of applying a predetermined pre-tensioning force onto the threaded bolt 3 for a certain amount of time in the longitudinal direction of the bolt, in order to create the possibility of tightening or retightening in a torque-free manner the nut 4, screwed onto the threaded bolt 3, of the screw connection. For this purpose, an exchange socket of the tensioning device which is described in more detail in the following text is screwed onto the thread, protruding beyond the nut 4, of the threaded bolt 3 and subsequently put under hydraulic tension, as a result of which the threaded bolt 3 is extended in the longitudinal direction.

[0023]The screw-in depth of the threaded bolt is limited by the length, which is available as a bolt projection above the nut 4, of the threaded section A. The screw-in depth available should be ...

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Abstract

A tensioning device for extending a threaded bolt by tensioning the threaded end section thereof is connectable to a hydraulic supply. The tensioning device has a supporting tube surrounding the threaded end section. A cylinder is arranged in continuation of the supporting tube and s piston is arranged in the cylinder and movable in longitudinal direction of the cylinder. An exchange socket is screwable to the threaded end section and configured to be carried along axially by the piston. A pin is movably arranged in the longitudinal direction and has a pin body with a first pin end supported in the longitudinal direction against the threaded end section of the threaded bolt. A sensing device senses a position of the pin in the longitudinal direction. An evaluation and control unit connected to the sensing device is acting on the hydraulic supply to enable the hydraulic supply.

Description

BACKGROUND OF THE INVENTION[0001]The invention relates to a tensioning device for extending a threaded bolt by way of tension on the threaded end section thereof, having a supporting tube surrounding the threaded end section, a cylinder which is arranged in continuation of the supporting tube and has at least one piston that is movable in the longitudinal direction therein and is connectable to a hydraulic supply, an exchange socket which is screwable to the threaded end section and is configured such that it can be carried along axially by the piston, and a pin which is arranged so as to be movable in the longitudinal direction and the pin end of which is supportable in the longitudinal direction against that end of the threaded bolt that has the threaded end section.[0002]A hydraulically operating bolt tensioning device having these features is known from U.S. 2011 / 0271798 A1. The tensioning device has measures for monitoring the thread projection, i.e. the length of the threaded ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B23P19/06
CPCB23P19/067B25B29/02F16B31/025F16B31/043
Inventor HOHMANN, JORGHOHMANN, FRANK
Owner HOHMANN JORG
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